Customers have complained about long check-in time at the Top Max Hotel. Manager Ramp started studying the process by measuring check-in time using a sample of 4 check-ins per day over a period of 30 days. An excerpt of that data, consisting of the first 5 days of data, are shown below

Observations
	1	2	3	4
Day 1	6.01	4.28	7.32	7.03
Day 2	5.77	8.22	2.3	4.11
Day 3	7.02	7.72	6.45	6.57
Day 4	5.9	8.12	7.12	6.7
Day 5	6.9	4.96	4.85	6.21

Ramp would like your help in identifying what control chart(s) to use.

• Please identify and report the type of control chart(s) that would be appropriate if only this data is available, and provide a one-sentence justification for the same.
• Describe how you would go about calculating the Center Line(s) for the control chart(s).